Transmission coolers - low temps and bypass thermostats - Tests and results
#41
Contributing Member
#42
Ok, we are the same page now. I can see your points and you and B&M are probably correct. I should probably also take down that "best" pic unless I am willing to try and prove it. I'd probably waste my time and end up proving myself wrong. But I have had good temps running that way in the past, although now I have both inlet and outlet up (BTW I don't see better or worse temps but its hard to compare since the location changed too).
I too have had a semester of fluids and thermo I & II, BSME here. There was one project I was working on for Dana Corp redesigning a water jacket for a water cooled brake. We had previously done some testing with a clear plexiglass cover over the water jacket to see the flow. So I've been trying to think of a way to do some visual testing with the atf flow. Hmmm....anyway thanks for the info.
I too have had a semester of fluids and thermo I & II, BSME here. There was one project I was working on for Dana Corp redesigning a water jacket for a water cooled brake. We had previously done some testing with a clear plexiglass cover over the water jacket to see the flow. So I've been trying to think of a way to do some visual testing with the atf flow. Hmmm....anyway thanks for the info.
Yeah, I am not surprised that your temps have been fine. I am a BSME too, so this was kind of a fun discussion. I would love to see some visuals of a cooler filling. I would also like to see the flow analysis across temps that B&M has apparently done to see the flow ratio's in the bypass vs the rest of the cooler at low and high temps. Without a temp activated switch like in the inline bypass switches, it becomes a more subtle effect.
#43
Contributing Member
Yeah, I'll keep my eye open for something clear with lots of small tubes, but so far I've not thought of anything except making a manifold with lots of thin plastic tubing going out the side and into other manifold, but I"ll need some R&D funding to get that motivated.
One possible variable I've thought of is whether or not the cooler drains into the pan during shutdown and factors with that may be the cooler being higher or lower than the tranny.
One possible variable I've thought of is whether or not the cooler drains into the pan during shutdown and factors with that may be the cooler being higher or lower than the tranny.
Last edited by mt_goat; 03-04-2011 at 09:27 AM.
#44
Registered User
B&M's side mounting requirements seem odd to me. Input on bottom, output on top? I've mounted both my B&M installations the opposite of that (in/top, out/bottom). Just seemed logical to me. Maybe when I upgrade from my 70268 to a 70264 this spring, I'll run the lines that way.
Regardless of where tranny cooler is mounted, bottom will ensure that full cooler fills with fluid before exiting as there will always be fluid/system pressure to push the fluid through, it doesn't rely on thermal convection/flow (i.e., heat rising, cold sinking, etc) to move fluid through..
#45
Registered User
It also makes sense as to why B&M recommends in bottom and out top when mounted sideways. Gravity should keep fluid in place and combat any suction, except perhaps the little bit in the input and/or output hoses that would flow back to the pan via gravity. Not sure how the tranny pump works but it likely has some back flow anti-drainback prevention in it too, so it's likely just the output/return hose that would be a potential issue, but not the input. And if routing through standard radiator cooler on the way back too, it would also help to mitigate any excess backflow too I'd think.
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